Rotary damper



FIG. 1 is a perspective view of a rotary damper showing my new design;

FIG. 2 is a front view thereof; a rear view being the same as the front view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a left side view thereof; a right side view being the same as the left side view. 

The ornamental design for a rotary damper, as shown and described. 